According to NASA’s newly released statement, SpaceX is now targeting November 2017 and May 2018 for conducting unmanned test flight and a crewed flight of Crew Dragon spacecraft, respectively.

Previously, the private-sector space firm was targeting May 2017 and August 2017 for conducting unmanned test flight and a crewed flight of the spacecraft, respectively.

SpaceX has also confirmed that it has delayed the test flights for the Crew Dragon spacecraft. The company explained that it needed more time to test designs, systems and processes.

The space firm said in a statement, “We are carefully assessing our designs, systems, and processes taking into account the lessons learned and corrective actions identified. Our schedule reflects the additional time needed for this assessment and implementation.”

SpaceX is developing Crew Dragon spacecraft to carry NASA astronauts to and from the International Space Station (ISS). Currently, the American space agency depends on Russia’s Soyuz spacecraft. The contract will expire at the end of 2018.